Method of forming a such-back-preventing check valve in a liquid dispenser

ABSTRACT

A method for providing an integral check valve of the flap valve type in the discharge spout of a telescopically movable head of a liquid dispenser molded or formed of an elastomeric plastic material such as polypropylene or polyethelene.

United States Patent Kane, deceased et al. 1 1 Dec. 2, 1975 [5 METHOD OF FORMING A [58] Field of Search 264/138, 161, 163, 318; SUCH-BACK-PREVENTING CHECK VALVE 425/249, 289, 308, 310, 311, 468

IN A LIQUID DISPENSER [76] Inventors: Neil G. Kane, deceased, late of [56] 1 References cued Hacienda Heights, Calif.; by LNITED STATES PATENTS Virginia L. Kane, administrator, 3,064,310 11/1962 Cooprider 425/249 1 Rojas St Hacienda l-[eights 3,776,676 KESSIEI' Calif. 91745 Primary ExaminerRobert F. White [22] Flled' 1974 Assistant Examiner-T. E. Balhoff [21] Appl. N0.: 514,846

T Related US. Application Data L th d f d B t 1 h k l fth me 0 or PI'OVI mg an m egra 0 cc va ve o e [62] 1973 flap valve type in the discharge spout of a telescopically movable head of a liquid dispenser molded or [52] U 5 Cl 264/163. 264/3318 425/249 formed of an elastomeric plastic material such as poly- 425/289 propylene or polyethelene. [51 Int. Cl. B28B 7/28 2 Claims, 6 Drawing Figures US. Patent Dec. 2, 1975 3 ,923,949

METHOD OF FORMING A SUCI-I-BACK-PREVENTING CHECK VALVE IN A LIQUID DISPENSER This application is a division of pending application Ser. No. 426,942, filed Dec. 20, 1973 now abandoned.

BACKGROUND OF THE INVENTION The formation of an integral flap type valve of the above character which is molded as part of a member of the dispenser.

The applicant has no knowledge of prior art teaching the forming of an integral check valve flap in the outlet of a liquid dispenser, that includes the step of separating the lateral edges of the flap from the wall of the outlet after the element having the outlet has been formmolded.

SUMMARY OF THE INVENTION The method of providing the depressible plastic molded depressible head of a liquid dispenser with a suck-back-preventing check valve in the form of a flexible flap which has a normal inward flow-stopping position and opens to permit outward flow. The flap, during molding, is formed in non-flexing condition and has its lateral edges separated from the passage it closes after molding and setting of said head.

In the drawing, like reference characters designate similar parts in the several views.

BRIEF DESCRIPTION OF THE DRAWING FIG. 1 is a longitudinal sectional view of the upper end of the dispensing head of a liquid dispensing device provided with a suck-back-preventing check valve formed by the present method.

FIG. 2 is a cross-sectional view as taken on the plane of line 2-2 of FIG. 1.

FIG. 3 is an enlarged longitudinal sectional view as taken on the plane of line 3-3 of FIG. 2, and shown with a core pin in place during molding of the dispensing head.

FIG. 4 is a vertical sectional view as taken on the plane of line 4-4 of FIG. 3.

FIG. 5 is a longitudinal sectional view on the plane on which FIG. 3 is taken, and showing the core pin partly retracted while shearing the side edges of the check valve from the adjacent lateral passage walls of the discharge portion of the dispensing head.

FIG. 6 is a sectional view on the same plane as FIG.

5, showing the flap in the position thereof after the core pin has been entirely retracted.

DESCRIPTION OF THE PREFERRED METHOD The present method has basis on a dispenser head 10 that is provided with an annular chamber 11 that is open at its bottom to receive liquid that is compressed upwardly from below as said head is pressed in a downward direction. Said head is shown with a laterally directed spout 12 for discharging liquid under the mentioned pressure from below. At 13 is shown the flap of the suck-back-preventing check valve.

As can be seen in several figures of the drawing, the flap valve 13 is molded of the semi-plastic elastomeric material of which the head 10 is formed. The spout passage 14, at its inward end 15, where the same joins the annular chamber 11, has a rectangular cross-sectional shape, the same being molded around the rectangular end 16 ofa core pin 17 that is preferably cylindrical to form the passage 14. An upwardly sloping notch 18 in the end face 19 of the end 16 of the core pin produces a similarly sloping transverse web 20 that, during molding of the head 10, spans between the side walls of the rectangular end 15, as shown in FIG. 4.

Upon extraction of the core pin 17 from the molded head 10 after the semi-plastic material thereof has cured or, at least partly cured, the slant of the notch 18 will cause the web 20, as the core pin is extracted, to become sheared and separated from the side walls of the inward end 15 of the spout-passage. FIG. 5 shows a partial extraction of the core pin. Upon total extraction of the core pin, the web 20 will have been shorn from the side walls of the passage end 15 and remains connected to the wall 21 only at its rearward end. Upon such extraction of the core pin, the web is converted into a flap which, having been molded with an upward slant, as in FIG. 3, naturally returns to its upwardly and forwardly slanted position as in FIG. 6. In this regard, note how, upon such extraction of the core pin, the walls of notch 18 of said pin forces the mentioned shearing of the opposite edge of the web 20 from said passage walls 15.

While the foregoing has illustrated and described what is now contemplated to be the best mode of carrying out the invention, the construction is, of course, subject to modification without departing from the spirit and scope of the invention.

Having thus described the invention, what is claimed and desired to be secured by letters Patent is:

I. The method of molding a check valve in the form of a flap to control liquid flow between a chamber in the manually telescopically movable head of a liquid dispenser that consists in the steps of:

molding said head of an elastomeric plastic to provide the same withconcentric coaxial walls that define said chamber,

simultaneously molding a laterally directed spout around a core pin to form a flow passage within said spout, with said spout extending from said coaxial chamber walls and the passage being open to the upper end of said chamber,

the end of the core pin being formed to simultaneously mold a bridge portion of said elastomeric material, the bridge portion extending outwardly from the inner of said coaxial walls on an upward and forward angle, transversely across the passage, and integrally united with the side walls of the spout, and

finally withdrawing the core pin from the passage to cause vertical relative movement between the bridge portion and the end of the core pin which causes the end thereof to shear the opposite ends of the bridge portion from the side walls of the spout to convert said bridge portion into a flap so the same is free to flap up and down according to changes in pressure in said chamber and said flow passage.

2. The method according to claim 1 in which the mentioned shearing of the bridge portion is carried out by the faces of a biased slot in the end of the core pin, the rear edge of the slot progressively effecting such shear of the flap from the side walls of the flow passage.

as the core pin is being withdrawn.

UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Inventor s Neil G. Kane, deceased by Virginia L. Kane It is certified that error appears in the above-identified patent L and that said Letters Patent are hereby corrected as shown below:

On the Title Page and in Column 1, in the Title, the

word "Such" should read Suck a Signed and Scaled'this ninth Day Of March 1976 [SEAL] Arrest:

RUTH C. MASON C. MARSHALL DANN Arresting Officer (ommissium'r nflarenls and Tradcmurkx 

1. THE METHOD OF MOLDING A CHECK VALVE IN THE FORM OF A FLAP TO CONTROL LIQUID FLOW BETWEEN A CHAMBER IN THE MANUALLY TELESCOPICALLY MOVABLE HEAD OF A LIQUID DISPENSER THAT CONSISTS IN THE STEPS OF: MOLDING SAID HEAD OF AN ELASTOMERIC PLASTIC TO PROVIDE THE SAME WITH CONCENTRIC COAXIAL WALLS THAT DEFINE SAID CHAMBER, SIMULTANEOUSLY MOLDING A LATERALLY DIRECTED SPOUT AROUND A CORE PIN TO FORM A FLOW PASSAGE WITHIN SAID SPOUT, WITH SAID SPOUT EXTENDING FROM SAID COAXIAL CHAMBER WALLS AND THE PASSAGE BEING OPEN TO THE UPPER END OF SAID CHAMBER, THE END OF THE CORE PIN BEING FORMED TO SIMULTANEOUSLY MOLD A BRIDGE PORTION OF SAID ELASTOMERIC MATERIAL, THE BRIDGE PORTION EXTENDING OUTWARDLY FROM THE INNER OF SAID COAXIAL WALLS ON AN UPWARD AND FORWARD ANGLE, TRANSVERSELY ACROSS THE PASSAGE, AND INTERGRALLY UNITD WITH THE SIDE WALLS OF THE SPOUT, AND FINALLY WITHDRAWING THE CORE PIN FROM THE PASSAGE TO CAUSE VERTICAL RELATIVE MOVEMENT BETWEEN THE BRIDGE PORTION AND THE END OF THE CORE PIN WHICH CAUSE THE END THEREOF TO SHEAR THE OPPOSITE ENDS OF THE BRIDGE PORTION FORM THE SIDE WALLS OF THE SPOUT TO CONVERT SAID BRIDGE PORTION INTO A FLAP SO THE SAME IS FREE TO FLAP UP AND DOWN ACCORDING TO CHANGES IN PRESSURE IN SAID CHAMBER AND SAID FLOW PASSAGE.
 2. The method according to claim 1 in which the mentioned shearing of the bridge portion is carried out by the faces of a biased slot in the end of the core pin, the rear edge of the slot progressively effecting such shear of the flap from the side walls of the flow passage as the core pin is being withdrawn. 